SUB28 Pro-amp

THe SUB28 Pro-amp is a compact, self powered subwoofer designed to extend the frequency range and power band-width of Audio Performance full-range loudspeaker systems. With a cut-off frequency of 45Hz, the SUB28 Pro-amp is made for applications where the reproduction of sub frequencies is of major importance (music, live sound). It consists of one long excursion 8 inch cone driver mounted in a heavily braced enclosure.
The SUB28 Pro-amp built-in electronics package features a new lightweight, two channel class D audio power amplifier designed specifically for self-powered products. The amplifier module is a sophisticated switch mode power supply, class-D amplifier design capable of delivering more than 2 x 500W RMS into 4 ohms and adding only 3 Kg to the weight of the cabinet.
Four presets are available on the back of the subwoofer. Preset 1 is the full range, flat frequency response for one SUB28 Pro-amp and one DRL12. Presets 2, 3 & 4 increase the Subwoofer level by step of +2dB.

Key features 
  • High power
  • Self powered
  • 45Hz cut-off frequency

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Frequency response (1):  45Hz - 120Hz

Maximum SPL peak (2):   122dB


Low frequency:   1 x 8" inch, ferrofluid cooled, long excursion cone driver


Output power (low) (5):   500W (EIAJ-1KHz, 1% THD)

Output power (sat) (5):   500W (EIAJ-1KHz, 1% THD)

THD, DIM, SMPTE:   <0,05%

Audio Input 

Type:   Analog Differential balanced input circuit

Connectors:    Female XLR; Male XLR loop

Nominal impedance:   10K Ohm

AC Power 

Connectors:   3-pin IEC male receptacle

Input voltage:   230V nominal +/- 10%, 115V optional


Sampling rate:   96 Khz

Basic delay:   0.76 ms

Dynamic range:   115 dB


Cabinet Size (WxHxD):   450 x 250 x 500 mm

Cabinet finish:   15mm plywood, black epoxy painted

Rigging:   M20 connecting plate

Weight:   16Kg

Elements & Accessories 
  • DRL-Stand
  • DRL12
  • DRL6
  • Qube3 Pro
  • Qube6 Pro

(1) Frequency response: +/- 3dB, measured at 3 meters, on axis, half-space conditions -  MLSSA 1/3 octave

(2) Max peak SPL: Measured with music referred to 1 meter

(3) Crossover: Acoustical crossover frequency - at these frequency, transducers produce equal sound pressure level

(4) AES: Power handling is measured under AES standard conditions

(5) Power AMPS: Amplifier RMS output power per channel into 2 ohms, both channel driven